SDL: wayland: Implement RestoreWindow for xdg/zxdg

SDL Commits
1 
From 213bfc194e889232a30fb3fb92159e128a76591a Mon Sep 17 00:00:00 2001
From: Ethan Lee <[EMAIL REDACTED]>
Date: Sun, 18 Apr 2021 09:36:54 -0400
Subject: [PATCH] wayland: Implement RestoreWindow for xdg/zxdg

---
 src/video/wayland/SDL_waylandwindow.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/video/wayland/SDL_waylandwindow.c b/src/video/wayland/SDL_waylandwindow.c
index a3029f033..54226981f 100644
--- a/src/video/wayland/SDL_waylandwindow.c
+++ b/src/video/wayland/SDL_waylandwindow.c
@@ -681,8 +681,11 @@ Wayland_RestoreWindow(_THIS, SDL_Window * window)
     SDL_WindowData *wind = window->driverdata;
     const SDL_VideoData *viddata = (const SDL_VideoData *) _this->driverdata;
 
+    /* Note that xdg-shell does NOT provide a way to unset minimize! */
     if (viddata->shell.xdg) {
+        xdg_toplevel_unset_maximized(wind->shell_surface.xdg.roleobj.toplevel);
     } else if (viddata->shell.zxdg) {
+        zxdg_toplevel_v6_unset_maximized(wind->shell_surface.zxdg.roleobj.toplevel);
     } else {
         wl_shell_surface_set_toplevel(wind->shell_surface.wl);
     }